Generally this is only useful in your .tfrc - or other script setup. It is slow since
the command has to be recompiled every time, and you don't get any return values.
diff -r -u tf-50b8-orig/help/topics/tf_module.html tf-50b8/help/topics/tf_module.html
--- tf-50b8-orig/help/topics/tf_module.html 2015-12-11 00:04:01.262394628 -0800
+++ tf-50b8/help/topics/tf_module.html 2015-12-11 00:02:05.235220563 -0800
@@ -11,7 +11,7 @@